<?php
namespace app\user\model;

/**
 * 微信支付服务器端下单
 * 微信APP支付文档地址: https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_6
 * 使用示例
 * 构造方法参数
 * 'appid' => //填写微信分配的公众账号ID
 * 'mch_id' => //填写微信支付分配的商户号
 * 'notify_url'=> //填写微信支付结果回调地址
 * 'key' => //填写微信商户支付密钥
 * );
 * 统一下单方法
 * $WechatAppPay = new wechatAppPay($options);
 * $params['body'] = '商品描述'; //商品描述
 * $params['out_trade_no'] = '1217752501201407'; //自定义的订单号，不能重复
 * $params['total_fee'] = '100'; //订单金额 只能为整数 单位为分
 * $params['trade_type'] = 'APP'; //交易类型 JSAPI | NATIVE |APP | WAP
 * $wechatAppPay->unifiedOrder( $params );
 */
class WeixinPay
{

    // 接口API URL前缀
    const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';

    // 下单地址URL
    const UNIFIEDORDER_URL = "/pay/unifiedorder";

    // 查询订单URL
    const ORDERQUERY_URL = "/pay/orderquery";

    // 关闭订单URL
    const CLOSEORDER_URL = "/pay/closeorder";

    // 公众账号ID
    private $appid;

    // 商户号
    private $mch_id;

    // 随机字符串
    private $nonce_str;

    // 签名
    private $sign;

    // 商品描述
    private $body;

    // 商户订单号
    private $out_trade_no;

    // 支付总金额
    private $total_fee;

    private $openid;

    // 终端IP
    private $spbill_create_ip;

    // 支付结果回调通知地址
    private $notify_url;

    // 交易类型
    private $trade_type;

    // 支付密钥
    private $key;

    // 证书路径
    private $SSLCERT_PATH;

    private $SSLKEY_PATH;

    // 所有参数
    private $params = array();

    public function __construct($appid, $mch_id, $notify_url, $key, $openid, $spbill_create_ip)
    {
        $this->appid = $appid;
        $this->mch_id = $mch_id;
        $this->notify_url = $notify_url;
        $this->key = $key;
        $this->openid = $openid;
        $this->spbill_create_ip = $spbill_create_ip;
    }

    /**
     * 下单方法
     *
     * @param $params 下单参数
     */
    public function unifiedOrder($params)
    {
        $this->body = $params['body'];
        $this->out_trade_no = $params['out_trade_no'];
        $this->total_fee = $params['total_fee'];
        $this->trade_type = $params['trade_type'];
        $this->nonce_str = $this->genRandomString();
        // $this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
        $this->spbill_create_ip = $this->spbill_create_ip;
        $this->params['appid'] = $this->appid;
        $this->params['openid'] = $this->openid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->nonce_str;
        $this->params['body'] = $this->body;
        $this->params['out_trade_no'] = $this->out_trade_no;
        $this->params['total_fee'] = $this->total_fee;
        $this->params['spbill_create_ip'] = $this->spbill_create_ip;
        $this->params['notify_url'] = $this->notify_url;
        $this->params['trade_type'] = $this->trade_type;
        // 获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::UNIFIEDORDER_URL);
        if (! $response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (! empty($result['result_code']) && ! empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 查询订单信息
     *
     * @param $out_trade_no 订单号
     * @return array
     */
    public function orderQuery($out_trade_no)
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        // 获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::ORDERQUERY_URL);
        if (! $response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        if (! empty($result['result_code']) && ! empty($result['err_code'])) {
            $result['err_msg'] = $this->error_code($result['err_code']);
        }
        return $result;
    }

    /**
     * 关闭订单
     *
     * @param $out_trade_no 订单号
     * @return array
     */
    public function closeOrder($out_trade_no)
    {
        $this->params['appid'] = $this->appid;
        $this->params['mch_id'] = $this->mch_id;
        $this->params['nonce_str'] = $this->genRandomString();
        $this->params['out_trade_no'] = $out_trade_no;
        // 获取签名数据
        $this->sign = $this->MakeSign($this->params);
        $this->params['sign'] = $this->sign;
        $xml = $this->data_to_xml($this->params);
        $response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::CLOSEORDER_URL);
        if (! $response) {
            return false;
        }
        $result = $this->xml_to_data($response);
        return $result;
    }

    /**
     * 获取支付结果通知数据
     * return array
     */
    public function getNotifyData()
    {
        // 获取通知的数据
        $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
        $data = array();
        if (empty($xml)) {
            return false;
        }
        $data = $this->xml_to_data($xml);
        if (! empty($data['return_code'])) {
            if ($data['return_code'] == 'FAIL') {
                return false;
            }
        }
        return $data;
    }

    /**
     * 接收通知成功后应答输出XML数据
     *
     * @param string $xml
     */
    public function replyNotify()
    {
        $data['return_code'] = 'SUCCESS';
        $data['return_msg'] = 'OK';
        $xml = $this->data_to_xml($data);
        echo $xml;
        die();
    }

    /**
     * 生成APP端支付参数
     *
     * @param $prepayid 预支付id
     */
    public function getAppPayParams($prepayid)
    {
        $data['appId'] = $this->appid;
        // $data['partnerid'] = $this->mch_id;
        $data['signType'] = 'MD5';
        $data['package'] = 'prepay_id=' . $prepayid;
        $data['nonceStr'] = $this->genRandomString();
        $data['timeStamp'] = time();
        $data['sign'] = $this->MakeSign($data);
        return $data;
    }

    /**
     * 生成签名
     *
     * @return 签名
     */
    public function MakeSign($params)
    {
        // 签名步骤一：按字典序排序数组参数
        ksort($params);
        $string = $this->ToUrlParams($params);
        // 签名步骤二：在string后加入KEY
        $string = $string . "&key=" . $this->key;
        // 签名步骤三：MD5加密
        $string = md5($string);
        // 签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }

    /**
     * 将参数拼接为url: key=value&key=value
     *
     * @param
     *            $params
     * @return string
     */
    public function ToUrlParams($params)
    {
        $string = '';
        if (! empty($params)) {
            $array = array();
            foreach ($params as $key => $value) {
                $array[] = $key . '=' . $value;
            }
            $string = implode("&", $array);
        }
        return $string;
    }

    /**
     * 输出xml字符
     *
     * @param $params 参数名称
     *            return string 返回组装的xml
     */
    public function data_to_xml($params)
    {
        if (! is_array($params) || count($params) <= 0) {
            return false;
        }
        $xml = "<xml>";
        foreach ($params as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
            }
        }
        $xml .= "</xml>";
        return $xml;
    }

    /**
     * 将xml转为array
     *
     * @param string $xml
     *            return array
     */
    public function xml_to_data($xml)
    {
        if (! $xml) {
            return false;
        }
        // 将XML转为array
        // 禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $data;
    }

    /**
     * 获取毫秒级别的时间戳
     */
    private static function getMillisecond()
    {
        // 获取毫秒的时间戳
        $time = explode(" ", microtime());
        $time = $time[1] . ($time[0] * 1000);
        $time2 = explode(".", $time);
        $time = $time2[0];
        return $time;
    }

    /**
     * 产生一个指定长度的随机字符串,并返回给用户
     *
     * @param type $len
     *            产生字符串的长度
     * @return string 随机字符串
     */
    public function genRandomString($len = 32)
    {
        $chars = array(
            "a",
            "b",
            "c",
            "d",
            "e",
            "f",
            "g",
            "h",
            "i",
            "j",
            "k",
            "l",
            "m",
            "n",
            "o",
            "p",
            "q",
            "r",
            "s",
            "t",
            "u",
            "v",
            "w",
            "x",
            "y",
            "z",
            "A",
            "B",
            "C",
            "D",
            "E",
            "F",
            "G",
            "H",
            "I",
            "J",
            "K",
            "L",
            "M",
            "N",
            "O",
            "P",
            "Q",
            "R",
            "S",
            "T",
            "U",
            "V",
            "W",
            "X",
            "Y",
            "Z",
            "0",
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9"
        );
        $charsLen = count($chars) - 1;
        // 将数组打乱
        shuffle($chars);
        $output = "";
        for ($i = 0; $i < $len; $i ++) {
            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;
    }

    /**
     * 以post方式提交xml到对应的接口url
     *
     * @param string $xml
     *            需要post的xml数据
     * @param string $url
     *            url
     * @param bool $useCert
     *            是否需要证书，默认不需要
     * @param int $second
     *            url执行超时时间，默认30s
     * @throws WxPayException
     */
    private function postXmlCurl($xml, $url, $useCert = false, $second = 30)
    {
        $ch = curl_init();
        // 设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        // 设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        // 要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if ($useCert == true) {
            // 设置证书
            // 使用证书：cert 与 key 分别属于两个.pem文件
            curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
            // curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);
            curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
            // curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
        }
        // post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        // 运行curl
        $data = curl_exec($ch);
        // 返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            return false;
        }
    }

    /**
     * 错误代码
     *
     * @param $code 服务器输出的错误代码
     *            return string
     */
    public function error_code($code)
    {
        $errList = array(
            'NOAUTH' => '商户未开通此接口权限',
            'NOTENOUGH' => '用户帐号余额不足',
            'ORDERNOTEXIST' => '订单号不存在',
            'ORDERPAID' => '商户订单已支付，无需重复操作',
            'ORDERCLOSED' => '当前订单已关闭，无法支付',
            'SYSTEMERROR' => '系统错误!系统超时',
            'APPID_NOT_EXIST' => '参数中缺少APPID',
            'MCHID_NOT_EXIST' => '参数中缺少MCHID',
            'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',
            'LACK_PARAMS' => '缺少必要的请求参数',
            'OUT_TRADE_NO_USED' => '同一笔交易不能多次提交',
            'SIGNERROR' => '参数签名结果不正确',
            'XML_FORMAT_ERROR' => 'XML格式错误',
            'REQUIRE_POST_METHOD' => '未使用post传递参数 ',
            'POST_DATA_EMPTY' => 'post数据不能为空',
            'NOT_UTF8' => '未使用指定编码格式'
        );
        if (array_key_exists($code, $errList)) {
            return $errList[$code];
        }
    }
} 